Enhanced high-temperature energy storage properties of polymer composites by interlayered metal nanodots

Abstract

The energy storage performance of polymer dielectrics decreases sharply owing to the inevitable conduction loss under harsh conditions, limiting their use in next-generation microelectronics and electrical power systems. However, previously...

Polyimide Nanocomposites Filled with SiO2 Nanoparticles of Different Sizes for High-Temperature Energy Storage

“…It can be seen that both ε 0 and E b are key factors to improve U e . The charge/discharge efficiency η is given by η = U d /( U d + U l ), where U d is the releasable energy density and U l is the lost energy density. − The high-temperature energy storage density and energy storage efficiency of SiO 2 /PI nanocomposites were analyzed by calculation of the D – E loop. As shown in Figure S6a–c, the high-temperature energy storage density of SiO 2 /PI nanocomposites with different particle sizes is greatly improved compared to pristine PI, and the efficiency is also higher.…”

“…In contrast, the dielectric constant of broadband nanofillers is generally not too high. The addition of wide-band nanofillers introduces trap depth, which enhances the trapping of space charge and improves the energy storage performance at high temperatures. − …”

Ultralow loading of carbon quantum dots leading to significantly improved breakdown strength and energy density of P(VDF-TrFE-CTFE)

“…Besides, CQDs can help prevent carriers from hopping due to the Coulomb blockade effect by restricting carriers in the deep traps. 37,50 According to Tanaka's multi-layer interface model for dielectric nanocomposites, there are bonded, bound, and loose layers, three types of interface layers, in the interface area, where the chain mobility increases successively. Deep traps can be formed in the bound layer at the interface, which are capable of capturing electrons and preventing them from moving.…”

Scalable High‐Permittivity Polyimide Copolymer with Ultrahigh High‐Temperature Capacitive Performance Enabled by Molecular Engineering

“…Next, we conducted fast discharge tests to evaluate the power density and discharge rate of the copolymer film, which are critical metrics for energy storage applications in power electronics. [48][49][50][51][52][53][54][55][56] As depicted in Figure 4e,f and Figure S38 (Supporting Information), the SO-PI-14.3 copolymer film also exhibits a faster discharge time (defined as the time for the discharged energy density to reach 95% of the maximum value) of 1.53 μs and a higher power density of 0.67 MW cm −3 at 200 °C and 200 MV m −1 , compared to 2.55 μs and 0.19 MW cm −3 of the BOPP at 70 °C, respectively. The power density is ≈3.5 times higher than that of BOPP at 70 °C under the same electric field.…”